Preheat oven to 375 degrees. Cut sausage into 1/2-inch pieces or form bulk sausage into small balls. Fry until well done. Pare and slice potatoes and apples. Mix salt, flour and sugar together and blend with cold water. Arrange layers of potatoes, apples and sausage in baking dish, pour flour mixture over each layer. Put apples and sausage on top. Add drippings. Cover; bake until apples and potatoes are tender, about 45 minutes.